Its not only the Catholics and the Protestants that are fighting each other. The whole Abrahamic faith is fighting each other. In fact, they all agree they are worshipping the same God. Look at the recent Mudland incident over "Allah". Look at the middle east. At least half of the worlds sorrows/wars would be gone if religion were never created, especially the Abrahamic faith in my opinion.
There is a need for accuracy here.
The problem happened because of women - two women in particular.
Sarah, Abraham's lawful wife, who encouraged Abraham to take on a concubine and then demanded that Abraham discard the concubine and her son.
Rebecca, Isaac's wife, who favoured Jacob over Esau and cheated her husband and her elder son in favour of her favourite son, Jacob.
The resulting problem between Isaac, son of Sarah and Ishmael, son of Hagar was believed to have been resolved and peace made between the two, 5000 years back.
God kept his promise to Abraham to take care of Ishmael and his mother. Note that Abraham loved Hagar and Ishmael.
The Jews and Arabs lived in peace for many hundreds of years.
The problem between Jacob and Esau existed today and will be in existence till the end of days.
Thus it is believed, not proved, that the problems between the Jews and Arabs today lie in the discord between Jacob and Esau.
Esau's children stir the discord between the Jews and the Arabs, over a strip of land.
As for the problems between the Catholics and the Protestants, this is the perennial problem of 'God loves me but hates them'. Some headway, in fact significant headway had been made by the Catholics in the direction of peace towards the Protestants, accepting them as brothers.
Christians and Jews, of the Abrahamic Faith, had made significant contributions to science, technology, economics, politics, music, world welfare, finance and others, contributions way beyond that of any other religion.
In my opinion, the world will be much poorer if not for the God of Abraham, Isaac and Jacob.
In my opinion, the desires of contentious men should not overshadow the contributions made by the many followers of the God of Abraham, Isaac and Jacob.